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Were people able to make weather predictions before thermometers and radar were invented?
1. yes
2. no
Answers: 1
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Which notation is used to represent an alpha particle? a. b. c. d.
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The mass of a bowling ball is 10 kg and the mass of a ping pong ball is 0.015 kg. if the two objects are 5 meters apart, what is the gravitational force ?
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Exercise 2. find the wavelength of a photon emitted when an electron jumps from the n = 3 energy level down to the n = 2 energy level. where is this photon in the electromagnetic spectrum?
Answers: 3
Were people able to make weather predictions before thermometers and radar were invented?
1. yes
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